Jenelle Evans doesn't have the greatest track record when it comes to telling the truth.
In fact, it's a pretty safe bet that if Jenelle's mouth is moving, she's lying -- especially if she's talking about her mouth.
Allow us to explain:
For years now, Teen Mom 2 fans have been scrutinizing Jenelle's dental situation.
In photos and videos -- even the ones she posts herself -- it often appears that Jenelle is missing teeth.
And we're not talking about an absent molar or two that might have been knocked out in some sort of accident.
No, some fans are convinced that Jenelle is missing most of her teeth and has been forced to invest in a set of dentures.
Needless to say, that's an unusual set of circumstances for young women who are still in their twenties.
But in Evans' case, there are two possible theories with regard to the cause of her jaw trauma.
We know that her husband, David Eason, is abusive because ... well, there's a mountain of evidence to that effect.
Most recently, Eason beat, shot and killed the family dog during one of his signature fits of rage.
And that certainly wasn't the first instance of David exhibiting violent behavior.
Remember when Jenelle called 911 on David after he allegedly attacked her during a "drunk and dramatic" altercation at the couple's home?
Those who have heard the recording are unlikely to ever forget it.
"My husband, he assaulted me. He pinned me down on the ground in the yard," a sobbing Jenelle told the dispatcher.
"I think I heard my f—ing collarbone crack. I can't move my arm."
So we suppose it comes as no surprise that some fans believe David knocked Jenelle's teeth out.
But that's just one theory.
As you probably know Jenelle has a long history of drug use, and some fans think that's the cause of her tooth loss.
Whatever the case, the rumors are persistent enough that Evans felt the need to address them un her Instagram Story on Wednesday:
"Let's put this rumor to rest everyone," she said when a fan asked about the theory.
"I have got a retainer that's like fake teeth, and that's what I had to straighten out my jaw," Evans added.
"I have my teeth — these are all my teeth," Jenelle said, pointing to her mouth
"And why did I need to straighten out my jaw?" she asked.
"Because I have an overbite really bad, and it almost touches the bottom of my teeth."
Of course, as many have pointed out on Twitter, at no point in the video does Jenelle show her teeth without the "retainer" in her mouth.
But regardless of whether or not she's telling the truth, the saddest part of this story might be that Jenelle felt the need to make the video at all.
"Isn't it sad that you have to prove you have teeth because nobody would be surprised if you lost them because of drugs or because your husband knocked them out?" wrote one Twitter user.
That just about sums this mess up.